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【简答题】
目前我国法定传染病有（）种，其中甲类传染病（）种、乙类传染病种、丙类传染病种，其中乙类传染病中的（）、（）和人感染高致病性禽流感，采取甲类传染病的预防、控制措施。
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【简答题】DFT中旋转因子的固有性质有 _______ 。 N=2 M 点DIF-FFT共有 M 级运算,每级共有 ____ 个蝶形运算 利用 线性调频z变换 可以实现窄带信号频率分辨率的快速分析,对于系统辨识问题,当系统频率响应的极点远离单位圆时,用CZT可以准确的快速测定 ____ 。
【单选题】听力原文：W: Good morning, Mr. Tim. It's a long time since I had the pleasure of a visit from you. M: Yes, it must be three or four years. I haven't visited you since I called about my will. You helped me ...
A.
Haifa year.
B.
Two years.
C.
Three or four years.
D.
More than five years.
【单选题】听力原文：W: Good morning, Mr. Tim. It's a long time since I had the pleasure of a visit from you. M: Yes, it must be three or four years. I haven't visited you since I called about my will. You helped me ...
A.
Half a year.
B.
Two years.
C.
Three or four years.
D.
More than five years.
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